Volume-phase transitions of cationic polyelectrolyte gels

Shinichi Kudo, Norio Kosaka, Mikio Konno, Shozaburo Saito

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


The swelling equilibrium behaviour of N-n-butyl-N,N-dimethyl-4-vinyl benzylammonium bromide (BBABr) gel was measured in aqueous solutions of various inorganic electrolytes: HBr, LiBr, NaBr, KBr, NH4Br, NaCl, NaI and NaClO4. The equilibrium swelling volume of BBABr gel does not depend strongly on the cationic species but on the anionic species. In aqueous solutions containing I- and ClO-4 ions, the volume-phase transitions of the BBABr gel were induced by a change in the concentration of the electrolytes. It was verified experimentally with 79Br n.m.r. and an ion electrode that the volume-phase transition is controlled by the change in the association state of the charged groups in the gel.

Original languageEnglish
Pages (from-to)5040-5043
Number of pages4
Issue number23
Publication statusPublished - 1992


  • N-n-butyl-N,N-dimethyl-4-vinylbenzylammonium bromide gel
  • electrolyte aqueous solution
  • ionic association
  • polyelectrolyte gel
  • volume-phase transition

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry


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